Superfluidity and dimerization in a multilayered system of fermionic polar molecules

Abstract

We consider a layered system of fermionic molecules with permanent dipole moments aligned by an external field. The dipole interactions between fermions in adjacent layers are attractive and induce inter-layer pairing. Due to competition for pairing among adjacent layers, the mean-field ground state of the layered system is a dimerized superfluid, with pairing only between every-other layer. We construct an effective Ising-XY lattice model that describes the interplay between dimerization and superfluid phase fluctuations. In addition to the dimerized superfluid ground state, and high temperature normal state, at intermediate temperature, we find an unusual dimerized "pseudogap" state with only short-range phase coherence. We propose light scattering experiments to detect dimerization.

4 pages main text + 3 pages supplemental Appendices, 4 figures

References in corpus (10)

• A High Phase-Space-Density Gas of Polar Molecules
• Strongly correlated 2D quantum phases with cold polar molecules: controlling the shape of the interaction potential
• Observation of dipole-dipole interaction in a degenerate quantum gas
• Quo vadis, cold molecules? - Editorial review
• Charge $4e$ superconductivity from pair density wave order in certain high temperature superconductors
• Stable Topological Superfluid Phase of Ultracold Polar Fermionic Molecules
• Competing orders in one dimensional spin 3/2 fermionic systems
• Quantum fluids of self-assembled chains of polar molecules
• Quantum phase transitions of polar molecules in bilayer systems
• Meta-nematic, smectic and crystalline phases of dipolar fermions in an optical lattice

Cited by in corpus (2)

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